Keeping Up With The Demand For Reliable
Power
BY JIM BURATTI AND TIM SIMONSON
For generations, people in North America have been able to place and
receive highly reliable voice calls on a legacy circuit-switch network. It
is so commonplace, we don't even think about it until there is a problem,
which is very rare. Behind each phone call is a rugged infrastructure that
carries this traffic. One of the hallmarks of this legacy system
infrastructure is a well thought-out power availability system. The highly
reliable level of service and availability in the legacy world are the
comparative standard to which convergent networks (VoIP and packet voice
networks) will be held to. Therefore, as the age of network convergence
accelerates, it is critical that network architects, engineers, operations
teams, and even end users create an equally reliable and available power
environment.
Without an end-to-end power availability plan, there is little chance
of a packet-based network meeting the user's expectation for reliability
in voice, fax, or video applications. However, much like a convergent
network is designed to be more efficient (from a total cost of ownership
perspective), scalable, and manageable, the power architecture of new
networks can be equally improved. For example, some companies' routers and
remote servers can be remotely managed -- so too can UPSs using Simple
Network Management Protocol (SNMP), IP interfaces, contact closures, or
out-of-band dial-in modems to extend control from the Network Operations
Center (NOC) to any site around the globe in real time.
ADDING UP THE OPTIONS
There are several differences and advantages to designing an AC
powered network.
One of the first differences between the legacy and convergent networks
is the power environment itself. The phone companies run their equipment
on -48vDC (minus 48 volts direct current - versus AC alternating current)
power in a central office environment. New Age carriers often operate
their equipment on AC power or a combination of AC power and DC power.
When designing a distributed, flexible, manageable, and reliable network,
it is often easier to standardize on AC power. AC power utility service is
readily available, therefore all that is needed is an intelligent UPS that
can condition the power and provide the desired battery runtime to the
equipment. Contrast this with DC power, which takes in AC power and then
uses an expensive system to invert the existing power down to -48vDC. No
question it can be a reliable architecture, but it can be overkill in
terms of total cost of the infrastructure.
AC UPSs are fully manageable just like any other network device. In
other words, using SNMP, IP interface, or dial-in out-of-band management
via an independent POTS (plain old telephone service) modem, a UPS can be
tied into the global NOC. By making the UPS part of the core network
infrastructure, users can increase the manageability and reliability of
their systems with real-time access to data which reports the power status
at every node or Point of Presence (PoP) on the network. This is a
significant improvement relative to the rudimentary dry contact closure
monitoring or basic on-site diagnostics provided by the average DC power
infrastructure.
For example, leading UPS manufacturers offer interfaces with network
device monitoring packages such as CA Unicenter,
Tivoli, HP OpenView,
etc. Or, the interfaces can be equally managed by using a proprietary
system and the UPS vendor's own software tools.
The return on investment and operational cost savings of a fully
monitored and managed power infrastructure pay for themselves through the
ability to dispatch planned maintenance calls rather than emergency
personnel to address or diagnose an issue. For example, UPS batteries will
need to be replaced on average between three and five years after
installation. By using intelligent monitoring and management, users can
identify the battery health and status of each UPS unit from the NOC, and
then plan accordingly. This is a practical example of proactively managing
the cost of ownership. Without such monitoring, the alternative is on-site
service inspection and testing or a shot-in-the-dark strategy of replacing
all batteries at the same time with no regard to whether they actually
need to be replaced.
Another smart power management opportunity is a power outlet control
device deployed in conjunction with a UPS. This type of device allows the
NOC to reboot hung network equipment without dispatching personnel to a
site. The control and reboot function can be done over the network, or if
the network itself is hung, via a regular telephone line into the device.
RAPID LINK STAYS UP
A good example of a company that has taken a comprehensive approach to
their power infrastructure is Atlanta-based Rapid
Link, Inc.. Rapid Link is an Internet-based communications service
provider that routes voice, data, and fax traffic over switched and IP
networks. Rapid Link has the ability to expand beyond voice into new
Internet protocol, data, and e-commerce applications, while continuing to
effectively control transmission costs. Each of Rapid Link's PoPs is fully
redundant by operating a UPS with generator backup and restricted, secure
access.
From a power perspective, Rapid Link has deployed UPS units globally to
their network node locations in conjunction with a management card that
gives users the ability to manage each device around the globe into their
Atlanta NOC. This system means they can install PoPs in almost any
location very quickly with eight hours of runtime, and full management and
monitoring capability from their fully staffed NOC.
When the UPSs perform periodic scheduled battery testing, the company's
operations staff receives data on all units that may need servicing in the
near future. This advance warning notice allows them to probe further by
pinpointing the device or scheduling a PoP or data center visit by the
appropriate technician, according to Dr. Bill Kennedy, chief technology
officer with Rapid Link.
"Without this intelligent communication with the UPS, we would
often have no other choice than to wait for a unit to fail and then create
a trouble ticket to correct the situation," Kennedy added. Rapid Link
realizes that it is very important that both a facilities and IT approach
to powering the network are considered when configuring the right
application for convergent carriers and legacy operators.
Rapid Link was able to standardize on a UPS model that met their goals
and was a widely available plug-and-play system. This matched their
objectives for a speedy network rollout without intensive on-site
installation and engineering required. The reliability of the systems has
translated into optimized network operations, which means optimized
revenue for Rapid Link's global voice network. The reliability and high
customer satisfaction experiences translate into word-of-mouth
recommendations and new customers for Rapid Link. Every time a call is
made on their network, its business reputation is tested. Because of a
sound power protection strategy, the company has insured that inevitable
power anomalies are not going to jeopardize its operations.
The challenge of convergent carriers to achieve their network
availability goals must include a sound power strategy. Leveraging the
flexibility, manageability, scalability, and cost of AC UPSs can actually
contribute to attaining aggressive business and operational goals. c
Jim Buratti is Internet market specialist for American Power
Conversion (APC), and may bee-mailed at [email protected].
Tim Simonson is manager, service provider customer segment, for APC. APC
is a global leader in the designing, manufacturing, and marketing of power
protection equipment, including surge suppressors, uninterruptible power
supplies (UPS), power conditioning equipment, and related software for
computer and computer-related equipment. Rapid Link has deployed the APC
Matrix UPS units globally, in conjunction with the APC Web/SNMP management
card. For more information about APC, visit the company's Web site at www.apcc.com.
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Remote Power Management
For Uptime And Availability
BY CHRIS HOLDER
As carriers speed to deploy integrated voice, data, and video
communications, additional equipment units are being rapidly installed to
build out new arms of an underlying infrastructure. The enabling
infrastructure that supports these new communications services is a
complex array of data communications and telecom equipment. A critical
success factor of implementing integrated communications is ensuring that
networks maintain maximum availability - leaving zero tolerance for
downtime due to crashed or failing equipment units.
CLECs, ILECs, IXCs, and ISPs are building new business models and
service offerings based on the dependability of data communications and
telecom internetworking equipment. While these carriers rely on battery
power (DC) or power conditioning/UPS (AC) to ensure power availability, a
dependable power supply alone cannot be relied on to maintain the
operational status of these devices. Despite high reliability assurances
from hardware manufacturers and software programs, equipment units do
malfunction. When equipment units "lock up" or fail, the most
proven method to restore the device to its operational state is to cycle
the power - a reboot. However, when equipment units are remotely located
in a distant POP site, co-location facility, or telco central office,
performing the reboot can be a costly function of time, distance, and
third-party expense. At risk for the service provider are lost revenue,
customer dissatisfaction, decreased productivity, and potential service
level agreement (SLA) penalties.
Consider what happens when a remote router locks up. The router's power
cord is connected to one of the UPS's multiple power outlets, but a UPS
does not have the ability to power cycle an individual power output
receptacle. The recovery action choices available to the network control
center are limited. The first option is a sledgehammer approach whereby an
operator commands the UPS to simultaneously power cycle the UPS and all
its attached devices. The second option is to find a technician that can
be dispatched to the remote location to power cycle only the locked-up
router. Neither choice is attractive or efficient.
POWERING AN INFRASTRUCTURE
One leading Internet telephony service provider has found a solution for
not only addressing the problem of crashed internetworking devices in
remote locations, but also faster installation and build-out of its
infrastructure. Net2Phone, the
first company to bridge the Internet with telephone networks, is using
remote power managers to ensure its global network of PC-to-phone,
phone-to-phone, fax-to-fax, and e-commerce solutions for businesses and
consumers maintains maximum uptime and availability.
Net2Phone offers the most advanced telecommunications application
harnessing the global power of the Internet, and has enabled more than
1,000,000 customers to place phone calls over the Internet at rates up to
95 percent less than current phone rates. Creating this new Internet
telephony service has required Net2Phone to build a network consisting of
servers, routers, CSU/DSUs, and other equipment units placed at several
international POPs. With a remote power management unit in place, the
recovery of a locked-up equipment unit is easy. A remote power manager
provides a logical, software-controlled interface to individual power
outlet ports. Now, upon receiving notification of a locked-up equipment
unit, a Net2Phone network operations center (NOC) can immediately reach
out to power cycle the individual equipment unit and quickly return it to
an operational status -- without interrupting all the equipment attached
to the UPS.
In addition to remotely rebooting devices, Net2Phone also utilizes a
unique feature of the power managers that it has deployed at more than 40
international POP sites. Asynchronous communications ports are built into
each unit, which allow a network operator to establish serial
communications to the management port for all the internetworking devices
located in an equipment rack.
Net2Phone found that being able to remotely establish a communication
session to the management console port on an internetworking device allows
the service provider to more quickly build its global infrastructure. As
Net2Phone deploys servers and other internetworking devices, the service
provider distributes the devices from a central "staging"
management center. The units are shipped to international locations, where
technicians follow master cabling and installation instructions from the
management center. Upon successful installation of the equipment units,
the Net2Phone management center connects to the power manager to
"power on" the devices. Then, via the asynchronous
communications ports, Net2Phone establishes a serial communications
session with each of the internetworking devices to remotely configure and
monitor each device in its Internet telephony POP site. This process
allows Net2Phone to dramatically reduce the time it takes to add new
international POPs to its global infrastructure.
Chris Holder is product marketing manager for Server Technology.
Server works with companies like Net2Phone, which uses the company's
Sentry Remote Power Managers. The Sentry Remote Power Managers are an
industrial product line that enables remote power control (off, on,
reboot, graceful shutdown) of servers and internetworking devices in
remote equipment rooms, POP sites, telco central offices, and other
co-location facilities. For more information, visit the company's
Web site at www.servertech.com. |